B. Serological Studies C. KSHV Prevalence and Risk for KS in Different Risk Groups for HIV Transmission D. KSHV Prevalence in Transplant Recipients V. Transmission of KSHV A. Sexual Transmission B. Transmission in Childhood C. Parenteral Transmission VI. Association of KSHV with Disease A. Kaposi's Sarcoma B. Body Cavity-Based Lymphoma/Primary Effusion Lymphoma C. Castleman's Disease and Related Lymphoproliferative Disorders D. Unconfirmed Links between KSHV and Other Diseases VII. Conclusion